body {
    /* background: #f2f2f2; */
    background: #282c34;
}

.frame {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    height: 400px;
    margin-top: -200px;
    margin-left: -200px;
    border-radius: 2px;
    box-shadow: 1px 2px 10px 0px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    background: #27ae60;
    color: #fff;
}

.circle {
    position: absolute;
    width: 200px;
    height: 200px;
    top: 100px;
    left: 100px;
    border-radius: 50%;
    border: 2px dotted #fff;
    transform-origin: 50% 50%;

    animation: circle 10s ease-in-out calc(var(--i) * -0.2s) infinite both;
}

@keyframes circle {
    0% {
        transform: scale(0) translate(-200px, -200px);
        opacity: 0.4;
    }
    100% {
        transform: scale(3.5) translate(0);
        opacity: 1;
    }
}
